Henry h



(No Model.)

H. HABARNARD.

GHUGK.

No. 271,208. Patented Jan. 30, 1883.

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ilivrrnn STATES Arresti" -rirrca HENRY H. BARNARD, OF ROCHESTER, NEW YORK, ASSIGNOR TO MILLIOENT B. ALLING, OF SAME PLAGE.

CHUCK.

SPECIFICATION forming part of Letters Patent No. 271,208, dated January S0, 1883.

Application filed April 14, 1S81. Renewed September 13, i882. (No model.)

To all whom it may concern:

Be it known that I, HENRY H. BARNARD,of Rochester, in the county of Monroe and State ol" New York, have invented an Improved Oh uck, of which the ibllowingis a specification, reference being had to the accompanying drawings.

My invention relates to certain improvemen ts in chucks, designed more particularly to be employed in the decoration ot' articles of china or pottery, but capable ot' being used for many other purposes; ,and myinvention consists in providing the centering-jaws of my improved chuck with an elasticcushion interposed between them and the article of china-ware for the purpose ot' compensating for the irregularities in the outline of the latter.

My invention also consists in the construction and arrangement of the mechanism for operating the centering-jaws, as hereinafter more fully set forth.

My improved chuck is represented in the accompanying drawings, in which Figure l is a plan view. Fig. 2 is a reversed view, showing the means by which the jaws are operated. Fig. 3 is a side elevation. Fig. 4 represents a modification. Fig. 5 is a vertical section ot' one ot' the jaws. Fig. Gis a section on the line zz, Fig. 2.

In theaecoinpanying drawings, representing my improved chuck, A is the face-plate; B, the hub,cast with the face-place, turning i'reely on the spindle N, projecting from the base M, provided with a milled thumb'nut, C. The face-plate is provided with curved slots S S S", in which thejaws J J J slide uniformly to and from the center. Thejaws are fastened to the arms H H' H, which are pivoted tothe under, side ofthe face-place at c c' c. The arms are joined together' by the bars E E', so that they move equally to and from the cent-er. (See Fig. 2.) One ofthe arms, H, is provided with a fixed screw, D, which turns in a nut', I, pivoted in the arm G, as shown in section in Fig. 6.

In the operation of my improved chuck the screw D, being revolved by means of the milled head F, carries the nut I forward or backward,

-thereby causing the arms H H H to swing about the pivots c c c and the jaws to nieve toward or away from the center of the face plate.

The bar E is pivoted to the arm H at d and to the arm H at e, and the arm H is connected to the arm Hll by bar E', pivoted atg on 55 H', and at li on El. The arm E is raised above the arm E by making the hubs on the arms and bars at e and d sufficiently long to enable the arms E and E to clear each other. l j

The positions of thejaw-carrying arms when 6o the jaws are widely separated is indicated by the dotted lines H H4 H5 in Fig. 2. The screw D is provided with collars titted on each side of'a divided lug, a., Fig. 1, attached to the rim ofthe faceplate, by which the screw is prevented from sliding lengthwise.

The nut I may be` pivoted within the arm Gr in a slot', which permits the swinging` 'motion ofthe arm, while the screw D remains stationary; or the screw may be allowed to swing 7o slightly to accommodate itself to the motion of the arm.

The jaws J J J are provided with hubs passing through the slots in the faceplate, and pivoted to the ends ofthe swinging arms by a screw or pin, as shown in Fig. 5.

For the purpose of holding articles of china or pottery ware during the process of decoration, the jaws are provided with a rubber ring, b, Fig. 5, which adapts itself to any ir: 8o regularities in the outline ot' the article operated upon, and holds the same in place with su'tticient pressure tol secure it centrally on the face-plate without danger ot' breakage. For other purposes, however', the rubber bands 85 may be omitted, and the jaws made of any preferred form. For wood-turning, the jaws ot' my improved chuck may be toothed or serrated on their inner faces.

In Fig. i I have represented a modified ar- 9o rangement ot' the device i'or movingand clamp,- ing the jaws, in which the pivoted end of the arm H is provided with a worm-gear,p, meshing with the worm D, provided with a thumb-nut, F, and attached t-o the under side ofthe face-plate in any convenient way. By revolving the thumb-nut F in one direction or the other the arm H is caused to swing about its pivotal point c and the jaws are opened or closed on the object to be checked, roo

which is secured to the face-plate by pressing rhejaws against it by the pressure produced l by the worin. The face-plate is preferably made thin and provided. with ribs about its edge-and about the slots S S to secure strength with lightness. `A spindle, N, (shown by dotted lines in Fig. 3,) rising upward from any suitable table or brace M, supports the hub B of the face-plate, which turns freely thereon.

The operation of my improved chuck will be readily understood from the preceding description. The jaws being separated b v turning the thumb-nut F, the article to be chucked is placed on the face-plate, and secured thereon by pressing thejaws against it by the action of the screw. After the article of pottery-ware has been centered on the face-plate, the latter is revolved by the operator turning the milled head C with one hand, while the other hand is left free to ornament the vase, plate, or other object in any preferred manner.

The jaws of my improved chuck are round, so that they present a similar surface to the object to be ehuclred in any position which they may occupyin the curved slots.` flhe round jaws provided with grooves also alord a simple and effective mode of attaching the rubber rings b to them.

I claiml. In a chuck for holding articles of potteryofthe movablejaws J J J, provided with an elastic cushion, substantially as and for the purposes set forth.

2. The combination, with the slotted faceplate A, of the movablejaws J J J, pivoted arms H H H, connecting-bars E E', and screw D, substantially as and for the. purposes set forth.

3. The combination, with the face-plate A, of the movable jaws J J J, provided with grooves for the reception of the elastic bands b b yb, substantiallyas described.

i HENRY' H. BARNARD.

Witnesses: Y

Gao. B. SELDEN, H. G. PHILLIPS.

ware, the combination, with the face-plate A, 

